Science China-Materials
·
2021
·Vol. 64
·期 9
·2202-2211
·
IF 8.273
Wang Yaqian,Shen Yongli,Xiao Xiong,Dai Linxiu,Yao Shuang,An Changhua
Metastable 1T′ MoTe 2 has attracted much attention as a cost-effective electrocatalyst for hydrogen evolution reaction (HER) in recent years. However, few studies were done over common stable 2H phase because it often exhibits inferior performance. Herein, stable 2H MoTe 2 with S-doped Te vacancies has been synthesized by one-step telluride conversion of 1T MoS 2 at 700°C under Ar/H 2 atmosphere. It is demonstrated that the synergistic effect of S-doping and Te vacancies changes the electronic structures of the catalyst. Density functional theory (DFT) studies show that plentiful electrons accumulate on the surface S atoms in S-doped Te vacancies of 2H MoTe 2 catalyst, which may be as active sites to promote HER. Moreover, the as-synthesized catalyst can be directly used as working electrode, and realizes current density of 100 mA cm −2 at overpotential of 217 mV with Tafel slope of 94 mV dec −1 . This work stimulates intensive studies on the activation of inert phase of other nanocatalysts towards various reactions.
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Advanced Science Letters
·
2013
·Vol. 19
·期 4
·1226-1228
·
IF 0
Chao Guoku,Shao Lianping,Yao Shuai,Hong Liming,Li Dashuai,Xiong Jing
7 Aza-Michael adducts, 3-(5-substituted-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-propionic acid ethyl esters were synthesized by 5-subtituted uracils and ethyl acrylate with ammonia as a catalyst. It was significant that the synthetic compounds were collected in almost quantitive yields
without column chromatography. The structures of the compounds were determined by NMR, mass spectra, X-ray crystallography analyses and elemental analyses.
研究领域:
有机化学
·
药物化学
·
杂环化学
·
合成方法学
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MOLECULES
·
2026
·Vol. 31
·期 16
·2878
·
IF 5.1
Bochen Jiang,Xiaojing Sui,Ziran Niu,Yanhua Lei,Jie Wang,Liu Hui,Bing Zhang,Jiangdong Cao,Yu Gu,Zhongzhou Cui
Solar-driven advanced oxidation processes and interfacial water evaporation represent promising strategies to simultaneously address water pollution and freshwater scarcity. However, conventional photo-Fenton catalysts are predominantly powder-based and suffer from difficult catalyst recovery, inefficient H2O2utilization, and limited practical applicability. Herein, a multifunctional bacterial-cellulose-based composite membrane (BC-MTP) was designed by immobilizing 1T-2H MoS2and a tea-polyphenol/polypyrrole (TP/PPy) copolymer through a blending–copolymerization strategy. The three-dimensional BC network anchors the catalytic components and supports their repeated use, while the BC-MTP membrane achieves 88.2% tetracycline removal using 20 μL H2O2, four times lower than the dosage used for the corresponding powder catalyst. Because dissolved Fe was not quantified by ICP-OES or ICP-MS, the present results are interpreted as evidence of improved H2O2utilization and component immobilization rather than quantitative proof of suppressed iron leaching. The incorporation of 1T-2H MoS2and TP/PPy also provides strong broadband light absorption and photothermal conversion, yielding a solar-driven evaporation rate of 1.34 kg m−2h−1and an energy efficiency of 80.1% under the tested laboratory conditions. This work demonstrates a membrane platform integrating photo-Fenton degradation and solar-driven water evaporation for water-purification applications.
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Junlong Niu,Shuai Chen,Wenna Zhang,Wenwen Zhang,Keke Chai,Guo Ye,Danqin Li,Weiqiang Zhou,Xuemin Duan,Jingkun Xu
Nanowire poly (3,4-dihydro-2 H -thieno [3,4- b ] [1,4]dioxepin-3-yl)methanol (PProDTM) free-supporting films with conductivities around 1.92 S cm −1 were prepared using a template-free electropolymerization method. The structure, morphology, mechanical properties, and thermal stability of the PProDTM films were characterized by Fourier transform infrared spectroscopy, UV–vis spectroscopy, scanning electron microscopy, dynamic mechanical analysis and thermogravimetric analysis . Moreover, the capacitance performances of PProDTM films were investigated in aqueous and organic electrolytes (acetonitrile (ACN) and dichloromethane (DCM)). In 0.1 M H 2 SO 4 , a symmetrical supercapacitor based on PProDTM exhibited specific capacitance of 89.2 F g −1 at a current density of 1.0 A g −1 , an energy density of 3.1 Wh kg −1 at power density of 0.5 kW kg −1 and the cycling capacitance retention was 74.8% after 5000 cycles. As the scan rate and current density increased, the specific capacitance of PProDTM films clearly decreased in DCM, but no obvious changes occurred in water and ACN. In ACN containing 0.1 M Bu 4 NBF 4 , a symmetrical supercapacitor based on PProDTM exhibited specific capacitance of 99.6 F g −1 at a current density of 1.0 A g −1 , an energy density of 3.5 Wh kg −1 at power density of 0.5 kW kg −1 and the cycling capacitance retention was 82.2% after 5000 cycles. These results imply that our flexible free-supporting PProDTM films are promising for future use in supercapacitors .
研究领域:
材料科学
·
电化学
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高影响因子
Nature Synthesis
·
2024
·
IF 0
Mei Liang,Gao Zhan,Yang Ruijie,Zhang Zhen,Sun Mingzi,Liang Xiongyi,Zhang Yuefeng,Ying Ting,Hu Honglu,Li Dengfeng,Zhang Qinghua,Gu M. Danny,Gu Lin,Zhou Jiang,Huang Bolong,Voiry Damien,Zeng Xiao Cheng,Chai Yang,Li Ju,Yu Xinge,Zeng Zhiyuan
Crystal phase plays a crucial role in determining the properties of two-dimensional (2D) transition metal dichalcogenides. Here we achieve phase-switchable preparation of 2D transition metal dichalcogenides using an electrochemical lithium-ion intercalation-based exfoliation strategy by controlling the discharge current density and cutoff voltage. We discover that a small discharge current density (0.005 A g −1 , with a 0.9 V cutoff voltage) produces pure semiconducting 2H phase WS 2 bilayers. In contrast, a large discharge current density (0.02 A g −1 , with a 0.7 V cutoff voltage) leads to the dominant semimetallic 1T′ phase WS 2 monolayers. The phase-switching mechanism was clarified through cryo-electron microscopy, annular dark-field scanning transmission electron microscopy, Raman, X-ray photoelectron spectroscopy, etc. The device (humidity sensor) application of produced 2D WS 2 was then demonstrated, showing phase-dependent humidity-sensing performances confirming the potential of our produced 2D WS 2 with switchable phase in device applications.
研究领域:
材料科学
·
纳米技术
·
电化学
·
传感器
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PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Xueya Liu,Yingqin Wei,Furong Tao,Xue Zhang,Ligang Gai,Libin Liu
Superhydrophobic surfaces with reversible switchable wettability have great application value in the treatment of oily wastewater. However, the advancement of switchable wettability surfaces is limited by the complexity of the manufacturing process and the excessive use of environmentally unfriendly solvents. Herein, an all-water-based reversible wettability coating was fabricated by simply spraying a water suspension consisting of N-[3-(trimethoxysilyl) propyl] ethylenediamine (AS)-, 3-(trimethoxysilyl) propyl methacrylate (KH-570)-, and 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS)-modified titanium dioxide (TiO 2 ) nanoparticles and cellulose . The coating possesses good adhesion with various substrates and exhibits stable mechanical and chemical stability as well as good resistance to harsh environments such as various organic solvents , strongly corrosive environments and extreme temperature environments. The coating can be switched between having superhydrophobicity (160°) and superhydrophilicity under UV irradiation and heating treatment. The coated cotton fabric can separate heavy/light oil-water mixtures and water-in-oil/oil-in-water emulsions with a high efficiency of greater than 95%. Due to the photocatalytic properties of TiO 2 , the coating can degrade soluble pollutants in water during UV irradiation, and the degradation efficiency is over 97%. This study provides a green industrial route for designing a simple, switchable wettability coating, which is expected to promote the large-scale industrial production and application of functional smart surfaces.
研究领域:
材料科学
·
环境科学
·
化学工程
·
表面化学
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高影响因子
Materials Today Energy
·
2024
·
IF 9
K.S. Chandrakantha,Z. Zuo,B.N. Chandrashekar,A. Amini,K.S. Rangappa,S. Srikantaswamy,C. Cheng
A composite catalyst, zinc-doped laser-reduced graphene oxide (LrGO), is synthesized with highly dispersed molybdenum disulfide (MoS 2 ) nanolayers using laser exfoliation followed by a hydrothermal process. The resultant LrGO–ZnO/1T–2H MoS 2 (GZM3) catalyst exhibits enhanced hydrogen evolution reaction (HER) catalytic performance and improved stability. It achieves small overpotentials of 94 and 191.5 mV at a current density of 10 mA cm −2 , under acidic and alkaline conditions, respectively. This superior catalytic activity is attributed to the high electrical conductivity and large electrochemical surface area of graphene, along with efficient charge transfer facilitated by Zn ions between LrGO–ZnO and 1T–2H MoS 2 .
研究领域:
材料科学
·
催化化学
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高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Ao Xu,Yan Liu,Jiahui Wang,Yijing Wang,Fuyi Jiang,Yanli Zhou
Limited by the poor electronic conductivity and strong interaction between Mg2+ and MoS2, the 2H phase of MoS2 as the cathode materials exhibits a low capacity along with poor rate capability. How to adopt the structure engineering to largely boost the Mg2+ diffusion kinetics and enhance the reaction activity are the current tasks that need to be addressed. Herein, the cation doping strategy is adopted to elaborately design the defective Cu-doped metallic MoS2 nanosheets (Cu-MoS2) via a hydrothermal process. The Cu2+ doping widens the layer distance, induces the formation of metallic 1T phase of MoS2, and ameliorates the structural stability. Thus, the Mg2+ ions diffusion kinetics and the electronic conductivity of Cu-MoS2 are largely boosted. Meanwhile, the MgCl+ in the electrolyte can decrease the reaction energy barrier, and therefore fasten the electrochemical reaction. Therefore, the optimized Cu-MoS2 as the cathode materials toward magnesium ion batteries exerts remarkable magnesium storage properties, evidently superior to the pure MoS2. When cycled at 0.1 A g-1 over 100 cycles, the discharge capacity can reach as high as 369.5 mAh g-1. Even cycled at a high rate of 1 A g-1, the Cu-MoS2 maintains a specific capacity of 267.3 mAh g-1 over 200 long cycles. The related kinetics tests confirm its rapid reaction kinetics and pseudocapacitance dominated charge storage process. The ex-situ XPS and HRTEM data largely verify the conversion reaction mechanism of Cu-MoS2 during cycling. This work provides guidelines for the long-term development of MoS2 in the field of magnesium ion batteries.
研究领域:
材料科学
·
电化学
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jian Feng,Shao-hua Luo,Peng-wei Li,Yi-cheng Lin,Lin Zhang,Qing Wang,Ya-hui Zhang
Hybrid hierarchical nanostructures have a significant impact on engineering novel anode materials for boosting the performance of sodium-ion batteries (SIBs). Here, a hierarchical porous structure constituted by CoSe nanocrystals embedded in nitrogen-doped carbon polyhedron with the embellishment of 2H-MoSe 2 nanosheets (CoSe@NC/MoSe 2 ) is fabricated by a metal-organic frameworks (MOFs)-engaged strategy and subsequent selenization reaction. The presence of N-doped carbon matrix and bimetallic selenides significantly enhance electronic and ionic diffusion kinetics. In addition, the porous structure provides short Na + diffusion distance and guarantees outstanding structural stability upon cycling. Due to these distinctive features, the CoSe@NC/MoSe 2 composite displays superior cyclability of 305.9 mAh g −1 up to 1500 loops at 5.0 A g −1 and exceptional rate property of 286.1 mAh g −1 at 10.0 A g −1 for sodium storage. When matched with Na 3 V 2 (PO 4 ) 3 @C cathode, a SIB full cell can maintain a high invertible capacity of 78.9 mAh g −1 total over 100 loops at 0.5 A g −1 . Moreover, the multistep conversion reactions mechanism is further identified by kinetics analysis, and ex situ and in situ characterization.
研究领域:
材料科学
·
电化学
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高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 1
·263-275
·
IF 3.186
Wei Jian,Huang He,Luo Qinglong,Liu Na,Wang Xueying,Wang Xuefeng,Zhong Mei,Huang Xueli
Few layer (< 5 layers) MoS 2 mixed with a 1T phase has the characteristics of a large specific surface area and an improved active site distribution. Therefore, it has been increasingly study for the catalytic hydrodesulfurization of polycyclic compounds. In this paper, few-layer MoS 2 with a high proportion of the 1T phase is synthesized by a one-step solvothermal method using a green non-toxic ethanol/water solvent. Results show that few-layer MoS 2 (3–5 layers) with a 1T phase up to 48% can be synthesized in a 50% ethanol solvent. This MoS 2 is used to catalyse the hydrodesulfurization reaction of dibenzothiophene, and the target product conversion rate reaches 84.2%. Among them, biphenyl accounts for 70.2%, phenylcyclohexane accounts for 13.9%, and bicyclohexane accounts for 0.4%. According to the Hansen solubility parameter (HSP) distance Ra, the effects of solvents on the structure and morphology of MoS 2 and the conversion of dibenzothiophene hydrodesulfurization are determined. This work is significant for the synchronous synthetic exfoliation of MoS 2 with a controllable number of layers, a higher ratio of the 1T phase and good catalytic HDS of polycyclic compounds. Graphic Abstract Few layers and high proportion of 1T phase MoS 2 by solvothermal synthesis for catalytic hydrodesulfurization of dibenzothiophene.
研究领域:
材料科学
·
催化化学
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Yongzhao Zhang,Xia Guo,Jianbing Ji
(2R,3S,4S,5S)-6-(Hydroxymethyl)-tetrahydro-2H-pyran-2,3,4,5-tetraol (d-glucose) solubility in 1-dodecanol, 1-decanol, and 1-octanol from 343.15 K to 393.15 K was determined, respectively. The solubility of d-glucose increased with an increase in temperature and decreased with the increase of fatty alcohol chain length. The modified UNIQUAC model, S-UNIFAC model, and mS-UNIFAC model were applied to predict the solubility data; the interaction parameters were determined. Of the three models, the modified UNIQUAC model showed better prediction accuracy.
研究领域:
化学工程
·
生物化学
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 22
·7493
·
IF 4.6
Hujun Niu,Xudong Chen,Yunbo Zhao,Junyi Zhou,Yimin Xie
To further our understanding of the change in association between lignin and carbohydrates after kraft pulping, isotope-labeled kraft pulp (KP) was prepared using13C and D double-isotope-labeled wheat straw, and it was subjected to enzymatic hydrolysis and ionic liquid treatment to explore the linkages between lignin and carbohydrate complexes in wheat straw. Isotope abundance determination showed that13C and D abundances in the experimental groups were substantially higher than those in the control group, indicating that the injected exogenous coniferin-[α-13C], coniferin-[γ-13C], andd-glucose-[6-D2] were effectively absorbed and metabolized during wheat internode growth. Solid-state CP/MAS13C-NMR spectroscopy showed that lignin was mainly linked to polysaccharides via acetal, benzyl ether, and benzyl ester bonds. Kraft pulp (KP) from the labeled wheat straw was degraded by cellulase. The obtained residue was fractionated using the ionic liquid DMSO/TBAH to separate the cellulose–lignin complex (KP-CLC) and xylan–lignin complex (KP-XLC). X-ray diffractometer determination showed that the KP-CLC regenerated cellulose type II from type I after the ionic liquid conversion. The13C-NMR spectrum of Ac-En-KP-CLC showed that the cellulose–lignin complex structure was chemically bonded between the lignin and cellulose through acetal and benzyl ether bonds. The13C-NMR spectrum of En-KP-XLC showed a lignin–hemicellulose complex structure, wherein lignin and xylan were chemically bonded by benzyl ether and acetal bonds. These results indicate that the cross-linking between lignin and carbohydrates exists in lignocellulosic fibers even after kraft pulping.Keywords:wheat straw;lignin–carbohydrate complex;isotope tracer;kraft pulping;ionic liquid
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高影响因子
危险品化学品经营许可证（带存储）